TTh_15 - Organic Lecture Series CH 310/318 M Textbook...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Organic Lecture Series 1 CH 310/318 M LECTURE 15 Textbook Assignment: Chapter 7 Today’s Topics: Alkene Alkene - Hydrogenations; Alkynes Hydrogenations; Alkynes -intro intro Notice & Announcements: HW 6 posted Organic Lecture Series 2 Reactions Reactions of Alkenes of Alkenes Chapter 6 Chapter 6
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Organic Lecture Series 3 • Most alkenes react with H 2 in the presence of a transition metal catalyst to give alkanes. – Commonly used catalysts are Pt, Pd, Ru, and Ni. – The process is called catalytic reduction catalytic reduction or, alternatively, catalytic hydrogenation catalytic hydrogenation. – Addition occurs with syn stereoselectivity. + H 2 Pd Cyclohexene Cyclohexane 25°C, 3 atm Reduction of Alkenes Reduction of Alkenes Organic Lecture Series 4 • “Mechanism” of catalytic hydrogenation. Reduction of Alkenes Reduction of Alkenes
Background image of page 2
Organic Lecture Series 5 Δ Δ H H o of Hydrogenation of Hydrogenation CH 2 =CH 2 3 CH=CH 2 Name Structural Formula Δ [kJ (kcal)/mol] Ethylene Propene 1-Butene cis -2-Butene trans 2-Methyl-2-butene 2,3-D imethyl-2-butene -137 (-32.8) -126 (-30.1) -127 (-30.3) -120 (-28.6) -115 (-27.6) -113 (-26.9) -111 (-26.6) Organic Lecture Series 6 • Reduction of an alkene to an alkane is exothermic. – There is net conversion of one pi bond to two sigma bond. Δ H o depends on the degree of substitution of the carbon atoms of the double bond.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/18/2012 for the course CH 310 M taught by Professor Iverson during the Spring '09 term at University of Texas at Austin.

Page1 / 9

TTh_15 - Organic Lecture Series CH 310/318 M Textbook...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online